男孩，8岁，髙热10小时，伴有头痛、呕吐，球结膜充血，全身散在瘀点，颈软。血压9.3/5.3kPa。脑脊液检查：细胞数15x106/L，蛋白微量，糖2.3-2.8mmol/L。下列哪项有助于快速诊断

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